An elevator energy saving control system

Abstract

The utility model discloses an elevator energy -conserving control system, include: battery module, including Y parallel battery group, and each battery group is formed by X electric core series connection, and battery module is connected with N elevators respectively through elevator independent interface module, energy -conserving control module is connected with N elevators communication to receive the use state of each elevator in real time, and can determine the electric core state of battery module, and generates control signal according to the use state and electric core state of each elevator, elevator independent interface module receives control signal, and the conduction or off between battery module and N elevators is controlled to realize that elevator charges to battery module, and battery module supplies power or prohibits power supply to elevator. The system of the application can recycle elevator regenerative energy, and has promoted the economy and reliability of elevator operation.

Description

Technical Field

[0001] This utility model relates to the field of elevator energy-saving technology, and in particular to an elevator energy-saving control system. Background Technology

[0002] Currently, elevators are powered by mains electricity. When the mains power fails, the elevator cannot operate stably for extended periods, disrupting daily work and life. Furthermore, the main circuit of the elevator generates regenerative energy, which is currently consumed by resistors, resulting in significant energy waste.

[0003] For example, Chinese patent CN115483734A utilizes an elevator energy storage stack to recover regenerative energy for elevator operation. It charges the energy storage stack during periods of lowest grid electricity price and discharges it to the elevator during peak hours, thus reducing elevator electricity costs. However, this patent employs a DC-DC converter between the energy storage stack and the elevator, resulting in redundant design, complex energy control algorithms, and the inability to feed power back to the grid. Furthermore, one energy storage stack in this patent corresponds to multiple elevators, but these elevators share the same grid power supply circuit. If one elevator malfunctions, the other elevators cannot receive normal energy storage power.

[0004] In addition, many low-voltage control devices in the elevator energy-saving control system in this patent require auxiliary power supply, resulting in long-term power consumption issues. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model proposes an elevator energy-saving control system.

[0006] This utility model proposes an elevator energy-saving control system, comprising:

[0007] The battery module includes Y parallel battery packs, each battery pack consisting of X cells connected in series. The battery module is connected to N elevators respectively through an elevator independent interface module.

[0008] The energy-saving control module communicates with N elevators to receive the real-time usage status of each elevator, and can determine the cell status of the battery module, and generate control signals based on the usage status of each elevator and the cell status.

[0009] An elevator independent interface module receives the control signal and controls the connection or disconnection between the battery module and N elevators to enable the elevator to charge the battery module, the battery module to supply power to the elevator, or disable power supply; wherein, the control signal includes a connection signal and a disconnection signal.

[0010] Preferably, it further includes:

[0011] The battery management module includes Y secondary battery management units and 1 primary battery management unit. Each secondary battery management unit detects the cell voltage and temperature of one battery pack. The primary battery management unit collects the total voltage and total current of the battery module. The output terminals of the Y secondary battery management units are electrically connected to the input terminal of the primary battery management unit, and the output terminal of the primary battery management unit is electrically connected to the input terminal of the energy-saving control module.

[0012] Preferably, the elevator independent interface module includes a circuit breaker, N positive contactors, N negative contactors, and N fuses; one elevator corresponds to one positive contactor and one negative contactor, each positive contactor is connected in series with a fuse and electrically connected to the positive terminal of the corresponding elevator, and each negative contactor is electrically connected to the negative terminal of the corresponding elevator; the circuit breaker is connected in parallel between the positive and negative terminals of the battery module, one end of the circuit breaker is electrically connected to one end of each of the N positive contactors, and the other end of the circuit breaker is electrically connected to one end of each of the N negative contactors.

[0013] Preferably, it also includes a conversion module, wherein the AC side of the conversion module is connected to the mains power and the DC side is connected to the battery module. The input terminal of the conversion module is connected in series with the first contactor and then electrically connected to the output terminal of the energy-saving control module. The conversion module is controlled by the energy-saving control module and can realize unidirectional charging of the mains power to the battery module or bidirectional charging and discharging between the mains power and the battery module.

[0014] Preferably, it also includes an auxiliary power supply module. The power input of the auxiliary power supply module includes mains power and a battery module. The auxiliary power supply module can convert the input power into a preset voltage to power the energy-saving control module and the battery management module, and can switch the power supply source according to the mains power status, battery voltage and electricity price period.

[0015] Preferably, the energy-saving control module integrates a cell status detection circuit, which includes: a differential voltage calculation unit for calculating the voltage difference between cells; and a comparison and judgment unit for comparing the detected voltage, temperature, cell SOC value, and differential voltage between cells with preset discharge allowable threshold, normal temperature range threshold, preset cell SOC threshold, and differential voltage setting threshold, and outputting the judgment result; the output terminal of the comparison and judgment unit is electrically connected to the input terminal of the control signal of the elevator independent interface module.

[0016] This invention discloses an elevator energy-saving control system, which includes a battery module, an energy-saving control module, an elevator independent interface module, a battery management module, a conversion module, and an auxiliary power supply module. The battery module connects to multiple elevators via the elevator independent interface module. The energy-saving control module controls the on / off state of the interface module based on the elevator's operating status and the battery cell status, thus achieving charge / discharge management. This system effectively recovers regenerative energy from the elevator, reduces electricity costs, and improves the economy and reliability of elevator operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the system architecture of an elevator energy-saving control system proposed in this utility model;

[0018] Figure 2 This is a schematic diagram of the battery module of an elevator energy-saving control system proposed in this utility model;

[0019] Figure 3 This is a schematic diagram of one embodiment of an elevator energy-saving control system proposed in this utility model. Detailed Implementation

[0020] Reference Figures 1-3 The present invention proposes an elevator energy-saving control system, comprising:

[0021] The battery module includes Y parallel battery packs, each battery pack consisting of X cells connected in series. The battery module is connected to N elevators respectively through an elevator independent interface module.

[0022] Specifically, such as Figure 2 As shown, the battery module consists of 120 50AH batteries connected in series, with a voltage platform of 360V to 432V. It is divided into 3 battery packs, each consisting of 40 cells connected in series.

[0023] The energy-saving control module communicates with N elevators to receive the real-time usage status of each elevator and can determine the cell status of the battery module. It generates control signals based on the usage status of each elevator and the cell status. The usage status includes elevator going up, elevator going down, elevator under maintenance, light load going up, and braking stop. The cell status includes normal charging and discharging status and discharge prohibited status.

[0024] Specifically, the energy-saving control module uses a BCE controller, which obtains the usage status of the battery module and each elevator through current sensors and voltage detection circuits.

[0025] In this embodiment, when the energy-saving control module generates the control signal, the charging and discharging process satisfies:

[0026] When elevator A out of N elevators is in a state of descending, lightly loaded ascending, or braking to a stop, and the SOC value of the battery module is less than the first preset threshold, the elevator independent interface module is turned on, so that the regenerative energy generated by the elevator descending charges the battery module.

[0027] When elevator B out of N elevators is in the upward state and the SOC value of the battery module is greater than the second preset threshold, the elevator independent interface module is turned on, so that the battery module supplies power to the corresponding upward elevator.

[0028] In this embodiment, when the energy-saving control module generates the control signal, the elevator's power supply process satisfies the following:

[0029] When elevator a is in a downward, lightly loaded upward, or braked stop state among N elevators, and elevator b is in an upward state, the regenerative energy generated by elevator a is preferentially supplied to elevator b after being converted by the battery module.

[0030] When the regenerative energy generated by elevator A powers elevator B and there is remaining energy, and the SOC value of the battery module is less than the first preset threshold, the remaining energy is stored in the battery module.

[0031] When the regenerative energy generated by the elevator in section a is insufficient to power the elevator in section b, and the SOC value of the battery module is greater than the second preset threshold, the elevators in section b, m, use the energy stored in the battery module for power supply, where m is less than or equal to b.

[0032] Specifically, the conditions for charging the battery module are as follows:

[0033] The SOC value of the battery module is less than the preset SOC threshold, or the total voltage of the battery module is lower than the preset total voltage threshold, or the voltage of one or more cells in the battery module is lower than the preset cell voltage threshold, or the SOC value of one or more cells in the battery module is lower than the preset cell SOC threshold.

[0034] Specifically, the discharge conditions for the battery module are as follows:

[0035] The SOC value of the battery module is greater than or equal to the preset SOC threshold, or the total voltage of the battery module is greater than or equal to the preset total voltage threshold, or the voltage of one or more cells in the battery module is greater than or equal to the cell voltage threshold, or the SOC value of one or more cells in the battery module is greater than or equal to the cell SOC threshold.

[0036] Specifically, the value of the first preset threshold is comprehensively determined according to the SOH of the battery module, the SOH of the battery cell, the ambient temperature, the working status of the fuse contactor, circuit breaker, power cable in the charging and discharging circuit and other working conditions in the control system. For example, when the first preset threshold is 95%, if multiple elevators are all in the descending operation, i.e., the power generation state, and the SOC value of the battery module is less than 95%, all the electricity generated by the elevators will be charged into the battery module through the busbar. When multiple elevators are all in the power generation state and the SOC value of the battery module is greater than or equal to 95%, all the electricity generated by the elevators shall be handled by the elevator equipment itself.

[0037] Specifically, the second preset threshold is w times the first preset threshold, where 0<w<1. When the first preset threshold is 95% and w=0.9, the second preset threshold is specifically 85.5%; when all elevators in group A are in ascending operation, i.e., the power consumption state, and the SOC value of the battery module is greater than 85.5%, the battery module preferentially supplies power to the elevator motor through the busbar to ensure the normal operation of the elevators; when all elevators in group B are in the power consumption state and the SOC value of the battery module is less than 85.5%, the commercial power supplies power normally to ensure the normal operation of the elevators.

[0038] When multiple elevators among N elevators are in operation, and the operating elevators include both power generation state and power consumption state, the power-generating elevators preferentially supply the generated power directly to the power-consuming elevators to ensure the normal operation of the elevators; when multiple elevators are in operation with both power generation state and power consumption state, the power-generating elevators preferentially supply the generated power directly to the power-consuming elevators to ensure the normal operation of the elevators, and when the SOC value of the battery module is less than 95%, the excess electricity is charged into the battery module; when multiple elevators are in operation with both power generation state and power consumption state, the power-generating elevators preferentially supply the generated power directly to the power-consuming elevators, and when the power is insufficient and the SOC value of the battery module is greater than 85.5%, the battery module outputs electric power for supplementary power to ensure the normal operation of the elevators; when multiple elevators are in operation with both power generation state and power consumption state, the power-generating elevators preferentially supply the generated power directly to the power-consuming elevators, and when the power is insufficient and the SOC value of the battery module is less than 85.5%, the commercial power supplies power normally to ensure the normal operation of the elevators.

[0039] In this embodiment, when the energy-saving control module generates a control signal according to the use state of the elevators, if it is detected that K elevators are in a maintenance state, it controls the positive contactor and negative contactor corresponding to the K elevators in the elevator independent interface module to disconnect; if all elevators are in a maintenance state, it controls all positive contactors and negative contactors in the elevator independent interface module to disconnect, and disconnects the circuit breaker between the battery module and the commercial power, where K<N.

[0040] The elevator independent interface module receives the control signal and controls the conduction or disconnection between the battery module and the N elevators, so as to realize that the elevators charge the battery module, the battery module supplies power to the elevators or prohibits power supply; wherein the control signal includes a conduction signal and a disconnection signal.

[0041] In this embodiment, it also includes:

[0042] The battery management module includes Y secondary battery management units and 1 primary battery management unit. Each secondary battery management unit detects the cell voltage and temperature of one battery pack. The primary battery management unit collects the total voltage and total current of the battery module. The output terminals of the Y secondary battery management units are electrically connected to the input terminal of the primary battery management unit, and the output terminal of the primary battery management unit is electrically connected to the input terminal of the energy-saving control module.

[0043] In this embodiment, the elevator independent interface module includes a circuit breaker, N positive contactors, N negative contactors, and N fuses; one elevator corresponds to one positive contactor and one negative contactor. Each positive contactor is connected in series with a fuse and is electrically connected to the positive terminal of the corresponding elevator. Each negative contactor is electrically connected to the negative terminal of the corresponding elevator. The circuit breaker is connected in parallel between the positive and negative terminals of the battery module. One end of the circuit breaker is electrically connected to one end of each of the N positive contactors, and the other end of the circuit breaker is electrically connected to one end of each of the N negative contactors.

[0044] In this embodiment, a conversion module is also included. The AC side of the conversion module is connected to the mains power, and the DC side is connected to the battery module. The input terminal of the conversion module is connected in series with the first contactor and then electrically connected to the output terminal of the energy-saving control module. The conversion module is controlled by the energy-saving control module and can realize unidirectional charging of the mains power to the battery module or bidirectional charging and discharging between the mains power and the battery module.

[0045] In this embodiment, an auxiliary power supply module is also included. The power input of the auxiliary power supply module includes mains power and a battery module. The auxiliary power supply module can convert the input power into a preset voltage to power the energy-saving control module and the battery management module, and can switch the power source according to the mains power status, battery voltage and electricity price period.

[0046] Specifically, the auxiliary power supply module receives power from both mains power and a parallel battery module, simultaneously transforming the input voltage to a preset voltage to power the conversion module and energy-saving control module. The auxiliary power supply module operates as follows:

[0047] When the auxiliary power supply module detects a mains power outage, it can switch to battery module power supply.

[0048] When there is mains power, but the battery module is depleted, the battery module voltage XB is lower than the power supply threshold XB. th At this time, the auxiliary power supply module controls the power input to switch from the battery module to AC power;

[0049] When the mains power is available, the battery module is powered, and the auxiliary power supply module receives the information that the mains electricity price is the lowest of the day, the auxiliary power supply module controls the power input to switch from the battery module to the mains power. The electricity price information of the auxiliary power supply module can come from the energy-saving control module or other external communication methods.

[0050] When there is mains power and the battery module is powered, and the auxiliary power supply module receives information that the mains electricity price is not at its lowest for the day, the auxiliary power supply module controls the power input to switch from mains power to the battery module. The electricity price information for the auxiliary power supply module can come from the energy-saving control module or other external communication methods.

[0051] In this embodiment, the energy-saving control module integrates a cell status detection circuit, which includes: a differential voltage calculation unit for calculating the voltage difference between cells; and a comparison and judgment unit for comparing the detected voltage, temperature, cell SOC value, and differential voltage between cells with preset discharge allowable threshold, normal temperature range threshold, preset cell SOC threshold, and differential voltage setting threshold, and outputting the judgment result; the output terminal of the comparison and judgment unit is electrically connected to the control signal of the elevator independent interface module.

[0052] Specifically, during system operation, when the voltage between any node in the DC circuit between the battery module and the elevator is negative V1, and the negative voltage V1 is greater than the DC bus voltage threshold V... th If the duration exceeds the time it takes for the elevator to descend / ascend by r floors, the energy-saving control module can disconnect the battery module and trigger a DC bus reverse connection fault alarm. Here, r represents the number of floors.

[0053] Example 1:

[0054] like Figure 3 As shown, Figure 3 T1+ and T1- are connected to the DC bus of the first elevator, with a DC meter FL1 connected in parallel and series. T2+ and T2- are connected to the DC bus of the second elevator, with a DC meter FL2 connected in parallel and series. T3+ and T3- ​​are connected to the DC bus of the first elevator, with a DC meter FL3 connected in parallel and series. T4+ and T4- are connected to the DC bus of the second elevator, with a DC meter FL4 connected in parallel and series. The energy-saving control module is specifically BCE, which detects the current I in the positive and negative circuits of the battery module through a shunt or other current sensor FL. bat The battery-side voltage V on the positive and negative circuits of the battery module is detected by B+ and B-. bat ; Detect the voltage V on the right side of the circuit breaker in the positive and negative circuits of the battery module. HV1The battery management module includes three secondary battery management units (BMU1-3) and a primary battery management unit (BCU); the energy-saving control module is connected to the converter module via a K5 charger contactor. The system operates as follows:

[0055] If the energy-saving control module detects that the AC power supply signal of elevator 1-4 is normally closed, it indicates that elevator 1-4 is in normal operation (i.e., non-maintenance state). Simultaneously, BCE obtains the status of each cell in the battery, including the cell voltage V, through BMU1-3. i All are within the normal charge and discharge allowable threshold range [V] th1 V th2 If the circuit breaker and positive / negative contactor are closed, the elevator will automatically draw power from the battery when it is running, and will automatically charge the battery when the elevator recovers energy.

[0056] If the energy-saving control module detects that the AC power supply signal of elevator 1-4 is normally closed, it indicates that elevator 1-4 is in normal operation (i.e., non-maintenance state). Simultaneously, BCE obtains the status of each cell in the battery module through BMU1-3, including the voltage V of one or more cells. i Below the discharge allowable threshold V th1 At this point, the battery module is in a non-discharge state. The central controller controls the positive and negative contactors to open, preventing the battery module from discharging into the elevator. Simultaneously, it controls the K5 charger contactor to close, controlling the charger to charge the battery module until the cell voltage exceeds the allowable charging threshold V. th2 The contactor of the K5 charger is disconnected; the positive and negative relays are closed again, allowing the battery module to discharge normally into the elevator.

[0057] If the energy-saving control module detects that the AC power supply signal to elevators 1-4 is disconnected, it indicates that elevators 1-4 are in maintenance mode. Simultaneously, the energy-saving control module controls BMU1-3 to obtain the status of each cell in the battery module, including the voltage V of one or more cells. i Below the discharge allowable threshold V th1 At this time, in order to reduce the self-power consumption of the battery module, BCE controls BMU1-3, circuit breaker, each contactor and IO to disconnect from power, and wakes up IO every T hours to check whether the elevator AC power supply signal is closed. If closed, it controls BMU1-3, circuit breaker, each contactor and IO to operate normally with power supply.

[0058] In this embodiment, the energy-saving control module expands the I / O ports through the first expansion module.

[0059] In this embodiment, it also includes:

[0060] The emergency power supply and debugging port module includes an emergency power supply unit and a debugging port unit. The emergency power supply unit is used to connect an external power source to the system or provide emergency power to external devices in emergency situations. The debugging port unit is used to connect the energy-saving control module to an external system for debugging, thereby facilitating the debugging of the energy-saving control module parameters.

[0061] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An elevator energy-saving control system, characterized in that, include: The battery module includes Y parallel battery packs, each battery pack consisting of X cells connected in series. The battery module is connected to N elevators respectively through an elevator independent interface module. The energy-saving control module communicates with N elevators to receive the real-time usage status of each elevator, and can determine the cell status of the battery module, and generate control signals based on the usage status of each elevator and the cell status. An elevator independent interface module receives the control signal and controls the connection or disconnection between the battery module and N elevators to enable the elevator to charge the battery module, the battery module to supply power to the elevator, or disable power supply; wherein, the control signal includes a connection signal and a disconnection signal.

2. The elevator energy-saving control system according to claim 1, characterized in that, Also includes: The battery management module includes Y secondary battery management units and 1 primary battery management unit. Each secondary battery management unit detects the cell voltage and temperature of one battery pack. The primary battery management unit collects the total voltage and total current of the battery module. The output terminals of the Y secondary battery management units are electrically connected to the input terminal of the primary battery management unit, and the output terminal of the primary battery management unit is electrically connected to the input terminal of the energy-saving control module.

3. The elevator energy-saving control system according to claim 1, characterized in that, The elevator independent interface module includes a circuit breaker, N positive contactors, N negative contactors, and N fuses; one elevator corresponds to one positive contactor and one negative contactor. Each positive contactor is connected to the positive terminal of the corresponding elevator by a fuse in series, and each negative contactor is connected to the negative terminal of the corresponding elevator. The circuit breaker is connected in parallel between the positive and negative terminals of the battery module. One end of the circuit breaker is electrically connected to one end of each of the N positive contactors, and the other end of the circuit breaker is electrically connected to one end of each of the N negative contactors.

4. The elevator energy-saving control system according to claim 1, characterized in that, It also includes a conversion module, whose AC side is connected to the mains power and whose DC side is connected to the battery module. The input terminal of the conversion module is connected in series with the first contactor and then electrically connected to the output terminal of the energy-saving control module. The conversion module is controlled by the energy-saving control module and can realize unidirectional charging of the mains power to the battery module or bidirectional charging and discharging between the mains power and the battery module.

5. The elevator energy-saving control system according to claim 1, characterized in that, It also includes an auxiliary power supply module, whose power input includes mains power and a battery module. The auxiliary power supply module can convert the input power into a preset voltage to power the energy-saving control module and the battery management module, and can switch the power source according to the mains power status, battery voltage and electricity price period.

6. The elevator energy-saving control system according to claim 1, characterized in that, The energy-saving control module integrates a cell status detection circuit, which includes: a differential voltage calculation unit for calculating the voltage difference between cells; and a comparison and judgment unit for comparing the detected voltage, temperature, cell SOC value, and differential voltage between cells with preset discharge allowable threshold, normal temperature range threshold, preset cell SOC threshold, and differential voltage setting threshold, and outputting the judgment result; the output terminal of the comparison and judgment unit is electrically connected to the input terminal of the control signal of the elevator independent interface module.

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